89 lines
3.0 KiB
Python
89 lines
3.0 KiB
Python
import asyncio
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import io
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import urllib.parse
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from pathlib import PurePosixPath
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from urllib.parse import unquote
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from wsgiref.handlers import format_date_time
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import fitz # PyMuPDF
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from PIL import Image
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from sanic import Blueprint, empty, raw
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from sanic.exceptions import NotFound
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from sanic.log import logger
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from cista import config
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from cista.util.filename import sanitize
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bp = Blueprint("preview", url_prefix="/preview")
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@bp.get("/<path:path>")
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async def preview(req, path):
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"""Preview a file"""
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maxsize = int(req.args.get("px", 1024))
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maxzoom = float(req.args.get("zoom", 2.0))
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quality = int(req.args.get("q", 40))
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rel = PurePosixPath(sanitize(unquote(path)))
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path = config.config.path / rel
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stat = path.lstat()
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etag = config.derived_secret(
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"preview", rel, stat.st_mtime_ns, quality, maxsize, maxzoom
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).hex()
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savename = PurePosixPath(path.name).with_suffix(".webp")
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headers = {
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"etag": etag,
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"last-modified": format_date_time(stat.st_mtime),
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"cache-control": "max-age=604800, immutable"
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+ ("" if config.config.public else ", private"),
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"content-type": "image/webp",
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"content-disposition": f"inline; filename*=UTF-8''{urllib.parse.quote(savename.as_posix())}",
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}
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if req.headers.if_none_match == etag:
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# The client has it cached, respond 304 Not Modified
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return empty(304, headers=headers)
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if not path.is_file():
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raise NotFound("File not found")
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img = await asyncio.get_event_loop().run_in_executor(
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req.app.ctx.threadexec, dispatch, path, quality, maxsize, maxzoom
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)
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return raw(img, headers=headers)
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def dispatch(path, quality, maxsize, maxzoom):
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if path.suffix.lower() in (".pdf", ".xps", ".epub", ".mobi"):
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return process_pdf(path, quality=quality, maxsize=maxsize, maxzoom=maxzoom)
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return process_image(path, quality=quality, maxsize=maxsize)
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def process_image(path, *, maxsize, quality):
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img = Image.open(path)
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w, h = img.size
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img.thumbnail((min(w, maxsize), min(h, maxsize)))
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# Fix rotation based on EXIF data
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try:
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rotate_values = {3: 180, 6: 270, 8: 90}
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orientation = img._getexif().get(274)
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if orientation in rotate_values:
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logger.debug(f"Rotating preview {path} by {rotate_values[orientation]}")
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img = img.rotate(rotate_values[orientation], expand=True)
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except AttributeError:
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...
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except Exception as e:
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logger.error(f"Error rotating preview image: {e}")
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# Save as webp
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imgdata = io.BytesIO()
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img.save(imgdata, format="webp", quality=quality, method=4)
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return imgdata.getvalue()
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def process_pdf(path, *, maxsize, maxzoom, quality, page_number=0):
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pdf = fitz.open(path)
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page = pdf.load_page(page_number)
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w, h = page.rect[2:4]
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zoom = min(maxsize / w, maxsize / h, maxzoom)
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mat = fitz.Matrix(zoom, zoom)
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pix = page.get_pixmap(matrix=mat)
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return pix.pil_tobytes(format="webp", quality=quality, method=4)
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